Update change log (and document how to do it)

[SmilyOrg]

The change log hasn't been updated since 2021, but we can do it retroactively to make it easier to understand the recent changes. See https://keepachangelog.com/en/1.1.0/

This can then be used as the base for our next (internal) API newsletter.

[ePaul]

@tkrop heard Github Copilot can do this. Do you want to give it a try?

[ePaul]

@tkrop experimented with Github Copilot and didn't find a way of doing this. @SmilyOrg do you think you can do that manually (i.e. take git log and edit it a bit down)?

[SmilyOrg]

@ePaul yeah I can give it a try! 👍

[SmilyOrg]

The only thing left is to document how #816 can be reproduced :)